Respuesta :

RickyChen
You need to categorize the similar terms with the same exponential.

Here, 3 terms can be categorized: x^3, x^2 and constant

Then you simply manipulate the coefficient:

(5-9)x^3 + (-7+4)x^2 + (6+1) = -4x^3 - 3x^2 + 7 
choixongdong
5x^3 - 7x^2 + 6 - 9x^3 + 4x^2 + 1
= -4x^3 - 3x^2 + 7 ...combine like terms

answer is A. -4x^3 - 3x^2 + 7

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